学術雑誌論文 Cesium ion detection by terahertz light

Ohkoshi, Shin-ichi  ,  Yoshikiyo, Marie  ,  Namai, Asuka  ,  Nakagawa, Kosuke  ,  Chiba, Kouji  ,  Fujiwara, Rei  ,  Tokoro, Hiroko

7 ( 1 )  , p.8088 , 2017-08 , Nature Publishing Group
ISSN:2045-2322
内容記述
Recent developments in terahertz technologies provide new tools for analysis, inspection, and nondestructive sensing. If a heavy atom is encapsulated in a cage of a porous material, the atom should vibrate slowly and resonate with a low-frequency terahertz light. From this perspective, a cyanide-bridged metal framework is a suitable system because it contains many cages that can adsorb Cs ions. Herein we show the vibration mode of a Cs ion in a cage of a cyanide-bridged metal framework. First-principles phonon mode calculations and terahertz time-domain spectroscopy (THz-TDS) measurements indicate that the vibration mode of a Cs ion in a cyanide-bridged manganese-iron framework is at 1.5 THz, which is significantly apart from other lattice vibrations. Taking advantage of this feature, we develop a THz-light detection method for Cs ions, which is useful for non-contact sensing of Cs ions in dangerous environments or harmful circumstances.
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